<template>
  <div>
    <!-- 面包屑导航区 -->
    <el-breadcrumb separator="/">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>

    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddCateDialog()">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格区域 -->
      <!-- 表格 -->
      <tree-table
        class="treeTable"
        :data="goodsCatesList"
        :columns="columns"
        :selection-type="false"
        :expand-type="false"
        show-index
        index-text="#"
        border
      >
        <!-- 是否有效 -->
        <template slot="isok" slot-scope="scope">
          <i
            class="el-icon-success"
            style="color: lightgreen;"
            v-if="scope.row.cat_deleted === false"
          ></i>
          <i class="el-icon-error" style="color: red;" v-else></i>
        </template>
        <!-- 排序 -->
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level===0 ">一级</el-tag>
          <el-tag size="mini" type="success" v-else-if="scope.row.cat_level===1">二级</el-tag>
          <el-tag size="mini" type="warning" v-else>三级</el-tag>
        </template>
        <!-- 操作 -->
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-delete">删除</el-button>
        </template>
      </tree-table>
      <!-- 分页区域 -->
      <el-pagination
        @size-change="handleSizeChange"
        @current-change="handleCurrentChange"
        :current-page.sync="queryInfo.pagenum"
        :page-size="queryInfo.pagesize"
        layout="prev, pager, next, jumper"
        :total="total"
      ></el-pagination>
    </el-card>

    <!-- 添加分类对话框 -->
    <el-dialog title="添加分类" :visible.sync="addCateVisible" width="50%" @close="addCateDialogClosed()">
      <el-form :model="addCateFrom" ref="addCateFormRef" :rules="addCateRules" label-width="100px" >
        <el-form-item label="分类名称：" prop="cat_name">
          <el-input v-model="addCateFrom.cat_name"></el-input>
        </el-form-item>
        <el-form-item label="父类名称：">
          <el-cascader
            v-model="selectedKeys"
            :options="parentCategory"
            :props="{ expandTrigger: 'hover', value:'cat_id', label:'cat_name', children:'children' }"
            @change="handleChange"
            clearable
            change-on-select="true"
          ></el-cascader>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>

<script>
export default {
  data() {
    return {
      goodsCatesList: [],
      queryInfo: {
        type: 3,
        pagesize: 5,
        pagenum: 1,
      },
      parentCategory: [],
      selectedKeys: [],
      total: 0,
      addCateVisible: false,
      addCateFrom: {
          cat_name:'',
          cat_pid:0,
          cat_level:0
      },
      addCateRules: {
        cat_name: [
          { required: true, message: "请输入分类名称", trigger: "blur" },
        ],
      },
      columns: [
        { label: "分类名称", prop: "cat_name" },
        { label: "是否有效", type: "template", template: "isok" },
        { label: "排序", type: "template", template: "order" },
        { label: "操作", type: "template", template: "opt" },
      ],
    };
  },
  created() {
    this.getAllGoodsCatesList();
  },
  methods: {
    async getAllGoodsCatesList() {
      const { data: res } = await this.$http.get("categories", {
        params: this.queryInfo,
      });

      if (res.meta.status !== 200)
        return this.$message.error("获取商品类别失败");
      this.goodsCatesList = res.data.result;
      this.total = res.data.total;
    },

    handleSizeChange(newSize) {
      this.queryInfo.pagesize = newSize;
      this.getAllGoodsCatesList();
    },

    handleCurrentChange(newPage) {
      this.queryInfo.pagenum = newPage;
      this.getAllGoodsCatesList();
    },

    async showAddCateDialog() {
      this.addCateVisible = true;
      const { data: res } = await this.$http.get("categories", {
        params: { type: 2 },
      });
      if (res.meta.status !== 200)
        return this.$message.error("获取父类目录失败");
      this.parentCategory = res.data;
    },

    // 级联控制器监听变化
    handleChange() {
        if(this.selectedKeys.length>0){
            this.addCateFrom.cat_pid = this.selectedKeys[this.selectedKeys.length-1]
            this.addCateFrom.cat_level = this.selectedKeys.length
        }else{
            this.addCateFrom.cat_pid = 0;
            this.addCateFrom.cat_level = 0;
        }
    },

    // 点击按钮添加分类
    addCate(){
        this.$refs.addCateFormRef.validate(async valid => {
            if(!valid) return
            const {data:res} = await this.$http.post('categories', this.addCateFrom)
            if(res.meta.status !== 201) this.$message.error("添加分类失败")
            this.$message.success("添加分类成功！")
            this.getAllGoodsCatesList()
            this.addCateVisible = false
        })

    },

    // 监听对话框的关闭事件，重置表单数据
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedKeys = []
      this.addCateFrom.cat_level = 0
      this.addCateFrom.cat_pid = 0
    }
  },
};
</script>

<style lang="less" scoped>
.treeTable {
  margin-top: 15px;
}
.el-cascader {
  width: 100%;
}
</style>